共查询到20条相似文献，搜索用时 218 毫秒
1.
叶赫金异常区位于山门银矿外围，其地质、物化探异常特征与山门银矿基本一致。本文利用地质、物化探方法对叶赫金异常区进行综合评价，并确定为隐伏矿异常。 相似文献
2.
山门银矿床物化探勘查效果及标志 总被引：1，自引：0，他引：1
本文着重阐述了山门银矿床地球物理、地球化学特征及物化探勘查效果。建立了山门锻矿床平面的物化探找矿标志和卧龙、龙王剖面的物化探找矿标志。总结了物化探方法与地质互相配合综合找矿的有效性。 相似文献
3.
顺昌县山后铅锌矿区在地质普查阶段投入了物化探工作,发现了物化探异常,结合矿区成矿地质条件,推断异常由隐伏含磁黄铁矿的铅锌矿(化)体引起,经工程验证得以证实,认为该区物化探异常是深部找矿的有效标志. 相似文献
4.
本文着重论述了山门银矿地球化学特征;水系沉积物,土壤及原生地球化学异常特征和分带性。初步概括出山门银矿床地球化学异常模式及找矿标志。 相似文献
5.
6.
7.
以甘肃南部碧口群分布区为例，提出用层镒分析法（AHP）对区域化探异常进行综合评价与筛选的思路和应用方法；根据区域化探异常所处的地质背景、物化探异常特征以及遥感解译信息的综合资料，用AHP建立区域化探异常的递阶层次模型；通过建立各层次的一系列判断矩阵，计算出各个异常最终的评序权重。根据权重大小筛选出的异常，评序结果可信，可用来预测找矿远景区。 相似文献
8.
俞 《四川地质科技情报》1994,(1):42-43
任何矿床的形成都是各种地质作用的综合效应，超大型矿床也不能例外。控制超大型矿床形成的地质因素及标志必然在地质、地球化学和地球物理综合信息上得到反映，形成地质异常和物化探异常。因此，应用地质异常理论和综合信息方法探索超大型矿床的特殊性是可行的预测途径。 相似文献
9.
10.
内蒙某水化学铀异常研究冷福荣（内蒙古第二物化探队，武川０１１７００）１地质及自然特征景观区内分布有太古界乌拉山群角闪斜长片麻岩和中无古界波尔泰群片岩、炭质板岩。华力西晚期碎裂花岗岩和花岗门长岩侵入上述地层中，北东向和近南北向断裂构造带发育。该区属干旱... 相似文献
11.
拟解析近似方法是一种求解积分方程的一种近似方法,它可以处理强散射或者大扰动的电磁散射问题,在计算过程中避免了传统微分数值方法解决问题时所遇到的大型矩阵或大型代数方程组的求解。孙建国[5]将其引入直流电场的积分方程中,并给出了求解异常电场积分方程的标量拟解析近似公式。在以前的研究中,已经验证了均匀场中异常球体的拟解析近似解的精度,这里对均匀场中的立方体异常体进行数值模拟,得到了直流电场中异常立方体模型的标量拟解析近似解。由于复杂地电模型可以用立方体的组合进行模拟,因此对立方体异常电场拟解析近似解的研究,为三维直流电场中复杂地电模型的快速正反演模拟打下了基础。 相似文献
12.
I. F. Malov 《Astronomy Reports》2014,58(3):139-144
Previously developed methods for estimating the angle β between the spin axis of a neutron star and its magnetic moment together with observational data for anomalous X-ray pulsars (AXPs) indicate that these objects are nearly aligned rotators, and that the drift model can be applied to them. The magnetospheres of aligned rotators are appreciably more extended than in pulsars with large values of β. With such extents for the magnetosphere, the conditions for the generation of transverse waves via the cyclotron instability are satisfied. The expected spectrum of the resulting radiation is very steep (its spectral index is α > 3), consistent with the observed radio spectra of known AXPs (α > 2). A large magnetosphere also favors the appearance of appreciable pitch angles for relativistic electrons, and therefore the generation of synchrotron emission. The maximum of this emission falls in the microwave range. This mechanism provides appreciable fluxes at frequencies of tens of gigahertz and can explain the observed enhanced AXP radiation in this range. 相似文献
13.
The question of why the observed periods of anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs) cluster in the range 2–12 s is discussed. The possibility that AXPs and SGRs are the descendants of high-mass X-ray binaries that have disintegrated in core-collapse supernova explosions is investigated. The spin periods of neutron stars in high-mass X-ray binaries evolve towards the equilibrium period, which is a few seconds, on average. After the explosion of its massive companion, the neutron star becomes embedded in a dense gaseous envelope, and accretion from this envelope leads to the formation of a residual magnetically levitating disk. It is shown that the expected mass of the disk in this case is 10?7–10?8 M⊙, which is sufficient to support accretion at the rate 1014–1015 g/s over a few thousand years. During this period, the star manifests itself as an isolated X-ray pulsar with a number of parameters similar to those of AXPs and SGRs. The periods of such pulsars can cluster if the lifetime of the residual disk does not exceed the spin-down timescale of the neutron star. 相似文献
14.
15.
We explore the possibility of explaining Anomalous X-ray Pulsars (AXPs) and Soft Gammaray Repeaters (SGRs) in a scenario with fall-back magnetic accretion onto a young isolated neutron star. The X-ray emission of the pulsar in this case originates due to the accretion of matter onto the surface of the neutron star from a magnetic slab surrounding its magnetosphere. The spin-down rate of the neutron star expected in this picture is close to the observed value. We show that such neutron stars are relatively young and are going through the transition from the propeller state to the accretor state. The pulsar’s activity in gamma-rays is connected with its relative youth, and is enabled by energy stored in a non-equilibrium layer located in the crust of the low-mass neutron star. This energy can be released due to the mixing of matter in the neutron star crust with super heavy nuclei approaching its surface and becoming unstable. The fission of nuclei in the low-density region initiates chain reactions leading to a nuclear explosion. Outbursts are probably triggered by instability developing in the region where the matter accreted by the neutron star accumulates in the magnetic polar regions. 相似文献
16.
V. M. Malofeev O. I. Malov D. A. Teplykh S. A. Tyul’bashev G. E. Tyul’basheva 《Astronomy Reports》2005,49(3):242-249
Observations of the anomalous X-ray pulsar (AXP) 1E 2259+586 and the AXP candidate 1RXS J1308.6+212708 at 111, 87, and 61 MHz are reported. The observations were carried out on two high-sensitivity radio telescopes of the Pushchino Radio Astronomy Observatory. Mean pulse profiles are presented, and the dispersion measures, distances, spectral indices, and integrated radio luminosities of both objects are estimated. Comparison with X-ray data shows large differences in the mean pulse widths and luminosities. The detection of radio emission from these two AXPs, together with other data, suggests the need to revise the radio-emission mechanisms in the magnetar model or the magnetar model itself. 相似文献
17.
微分测深装置视电阻率异常研究 总被引：2，自引：2，他引：0
微分测深以其独特的工作方式,较好的场地适应能力而广泛应用于工程地质勘察中.这里针对微分测深的工作方式,研究了供电电极AB距离大小对测深曲线的典型影响,并在此基础上,计算和对比分析了二维、三维地质构造不同测点的电测深曲线和视电阻率异常的主要特征,为微分测深的实际工作提供参考. 相似文献
18.
Fifty-four surface and twenty drill-hole waters were sampled in the vicinity of the old Eustis mine in the Eastern Townships of Quebec. Some of these waters were tested periodically over a three-month period. The purpose of the investigation was to develop a method for locating sources of anomalous waters using chemical analyses together with geomorphic and geologic evidence. Techniques have been developed which use chemical and hydrologic theory to estimate travel distance and location of the approximate source area of a water. The travel distance can be approximated as a function of hydraulic head, sodium concentration in the water, and an approximate constant which must be derived for the area.Water samples having anomalous concentrations of copper or zinc can be ascribed, in the specific region of this investigation, partly to contamination from mine workings (35%), partly to known mineralization (25%), and partly to unknown causes (40%). 相似文献
19.
Long period variations in the occurrence of prolonged intervals of calm magnetic field conditions are studied using index
Ap of magnetic activity. The solar-cycle variation in occurrence is compared with the sunspot number. Anomalous behaviour
for solar cycle 20, observed in other solar parameters, are shown to be manifested in the occurrence frequency of quiet intervals.
Spectral characteristics of occurrence indicates a dominant long period variation of about 30 years and a more feeble 11-year
oscillation 相似文献
20.
应用热带太平洋上层XBT温度资料,分析探讨了西太平洋暖池区次表层海温冷暖异常信号的变化规律,揭示了影响西太平洋暖池区次表层海温冷变异常的信号通道。分析表明,西太平洋暖池区的次表层海温异常变冷与太平洋北赤道流的海温冷异常信号西传有重要关系。北赤道流的海温异常冷(暖)信号是沿温跃层由赤道中东太平洋潜沉向西太平洋暖池区传播,与西太平洋次表层海温异常(冷)暖信号向赤道中东太平洋传播构成了热带海洋信号的气旋式"环流通道"。在这一"环流通道"中,北赤道流的海温异常信号西传是导致西太平洋暖池区及西太平洋次表层海温异常的重要机制,是影响厄尔尼诺(ElNino)和拉尼娜(LaNina)事件发生的关键。 相似文献